Polarizing plate and liquid crystal display employing the same
AssigneeKonica Corporation
InventorsNoriyasu Kuzuhara, Koji Tasaka, Hiroki Umeda, Takatoshi Yajima
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Abstract
A polarizing plate used in a vertical alignment mode liquid crystal display comprising a liquid crystal cell is disclosed, wherein the polarizing plate comprises a polarizing film and a mixed fatty acid cellulose ester film with optical biaxiality provided between the polarizing film and the liquid crystal cell, and wherein the mixed fatty acid cellulose ester film has a retardation in plane R0 of from 31 to 120 nm, and a retardation in the thickness direction Rt of from 60 to 300 nm, in which R0 is represented by the following formula (1) and Rt is represented by the following formula (2): R0=(nx−ny)×d formula (1) Rt={(nx+ny)/2−nz}×d. formula (2)
Claims13
A liquid crystal display comprising a polarizing film A, a polarizing film B, and a vertical alignment mode liquid crystal cell provided between the polarizing films A and B, one or more cellulose ester films A being provided between the polarizing film A and the liquid crystal cell, and one or more cellulose ester films B being provided between the polarizing film B and the liquid crystal cell,
- wherein the following inequalities are satisfied in the liquid crystal display:
- 60 nm≦ΣR0≦120 nm
- 100 nm≦ΣR0≦300 nm
- where ΣR0=ΣR0(A)+ΣR0(B), and ΣRt=ΣRt(A)+ΣRt(B), ΣR0(A) being the sum of retardation in plane of each of the one or more cellulose ester films A, ΣR0(B) being the sum of retardation in plane of each of the one or more cellulose ester films B, ΣRt(A) being the sum of retardation in the thickness direction of each of the one or more cellulose ester films A, and ΣRt(B) being the sum of retardation in the thickness direction of each of the one or more cellulose esters film B, and
- wherein at least one of the one or more cellulose ester films A and the one or more cellulose ester films B is a mixed fatty acid cellulose ester film, the mixed fatty acid cellulose ester film has a total acyl substitution degree of from 1.5 to 2.8 and an acetyl substitution degree of less than 2.0.
Dependencies are inferred from the claim text.